1. What is Nginx? From Google result, Nginx is a free, open-source, high-performance HTTP server and reverse proxy, as well as an IMAP/POP3 proxy server. Nginx is known for its high performance, stability, rich feature set, simple configuration, and low resource consumption. Nginx supports up to 50000 concurrent applications. 2. Forward And Reverse Proxy The forward proxy is a proxy server between the client and the target server. In order to obtain content from the original server, the client sends a request to the proxy server, and specifies the target server, after which the proxy transfers to the target server and returns the obtained content to the client.

1. Concept When it comes to trees, we must first talk about linear structures and nonlinear structures. The meaning of the data structure is to construct a set of interrelated data models, and then cooperate with the algorithm to solve some time-consuming operations in the computer. Linear and nonlinear are two very important data models. Linear structure: The relationship between data elements is one-to-one, and the data elements echo each other stack queue linear table array string Non-linear structure: the relationship between elements is not one-to-one, and each element may have a relationship with zero or more other data Two-dimensional array Multidimensional Arrays generalized table Tree picture So the concept of a tree is very clear.

1. The background of HashMap In this part, we first introduce hash tables and hashes from the advantages and disadvantages of arrays and linked lists. Take a look at the characteristics of hash tables and hashes compared to the first two. 1.1 Advantages and disadvantages of arrays First look at the memory structure diagram of the array. Looking at this picture, you should clearly see the characteristics, advantages and disadvantages of the array.

***The following content is for reference only and does not involve any investment. For specific content, please refer to the official government release! ! ! *** 1. Types of housing in Singapore Housing in Singapore is divided into HDB flats planned and built by the government, executive condominiums, and private commercial housing. Among them, private commercial housing is divided into landed housing and non-landed housing (ie apartments). HDB (House&Development Board)-built HDB flats and executive condominiums are all 99-year leasehold**, private residences are built by private real estate developers with 99-year, 999-year and permanent leaseholds difference.

1. Certified Kubernetes Administrator 2. The Exam Info 3. Certification Verification Tool You can access this link to verify the certification. Certification Verification Tool

We know that the core of Docker is resource isolation. Docker is equivalent to a process running on the Host, but how do these processes run independently without interfering with each other? This is about Docker’s CGroup and Namespace. The full name of CGroup is Control Group, which is used to set the limit of CPU, memory and IO resources used by the process. So CGroup is equivalent to resource control.